Whirlpool bathtub



FIG. 1 is a top perspective view of a whirlpool bathtub, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a framentary view thereof;

FIG. 5 is a top perspective view with the headrest removed to reveal additional features;

FIG. 6 is a rear view of that shown in FIG. 1;

FIG. 7 is a left side view thereof; and,

FIG. 8 is a right side view thereof.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a whirlpool bathtub, as shown and described. 